Chandrayaan Mission Thread

thomasantony

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Hey guys,
Chandrayaan - 1 is all set for launch on October 22. The launch vehicle is in the VAB right now. The spacecraft itself will be moved into the VAB tomorrow.

:cheers:

Quote from:
http://www.hindu.com/2008/10/12/stories/2008101260901000.htm

nat2.jpg

All set: The fully assembled PSLV-C11, which will launch Chandrayaan-1 on October 22, stands encased in the Vehicle Assembly Building of the second launch pad at Sriharikota on Saturday.

SRIHARIKOTA: If all goes well, Chandrayaan-1 spacecraft, to be launched by the Polar Satellite Vehicle (PSLV-C11) on October 22 at 6.20 a.m. from the Sriharikota space port, will reach the lunar orbit on November 8, according to M.Y.S. Prasad, Associate Director, Satish Dhawan Space Centre, Sriharikota.

About 1,000 engineers and technicians of the Indian Space Research Organisation (ISRO) have rolled up their sleeves and are working hard for the past two months to ensure a flawless launch. The 52-hour countdown will begin on October 20 at 4 a.m.
On Saturday, the PSLV-C11, which is 44.4 metres tall and weighs 316 tonnes, looked majestic in the huge Vehicle Assembly Building (VAB) of the state-of-the-art second launch pad on the Sriharikota island. As it gleamed in white and brown colours, the VAB’s massive doors, in contrast, shone in speckled grey.

“All checks on the vehicle are completed. The vehicle is now ready to receive the satellite,” declared T. Subba Reddy, Manager, Second Launch Pad, when journalists visited the complex.

A few kilometres away, Chandrayaan-1 spacecraft, which weighs 1,380 kg, is undergoing a battery of tests to test its flight-worthiness.
The spacecraft will be moved to the VAB on October 14 and married up with the PSLV-11. The “marriage ceremonies” such as filling Chandrayaan-1 with propellants and gas, and cobbling of the heat-shield which protects the spacecraft through searing heat when the rocket climbs through the atmosphere, will be performed over the next four days. On October 18 will begin the extremely slow journey of the rocket with the spacecraft, as if it were a temple chariot with the deity, from the VAB to the launch pad.
The PSLV, which stands on a mobile platform, will be wheeled on rail tracks to the launch pad, also called the umbilical tower, which is one km away. A powerful hydraulic bogey system will slowly pull the vehicle. The one-km journey will take two hours!
“The movement of the vehicle to the launch pad will take place on October 18. There will be minimum four days of work on the launch pad. The launch will take place on October 22 at 6.20 a.m., provided the weather supports us,” said M.C. Dathan, Director, Satish Dhawan Space Centre, Sriharikota.

However, V. Krishnamurthy, the Range Safety Officer for the mission, is a confident man. “Rains do not matter. The launch vehicle is rain-proof. It can get drenched and we can still launch,” he asserted.
The PSLV had lifted off earlier when it was pouring over the island. Only a cyclone would pose a problem to the launch on time. Since this was the time when the north-east monsoon set in, Mr. Krishnamurthy said ISRO had formed a team of weather specialists who would be in Sriharikota six days before the launch.
Depending on their inputs, ISRO would take a decision on when to ignite the rocket.
Chandrayaan-1 will carry 730 kg of propellants. About 600 kg of these propellants will be used to put the spacecraft into lunar orbit at an altitude of 100 km. The spacecraft will have a mission-life of two years and use up 70 kg of propellants during this period, Mr. Prasad said.
Chandrayaan-1 has 11 scientific payloads — five from India and six from abroad. The payloads from abroad includes those from NASA, the European Space Agency and Bulgaria. The payloads will map the chemicals and minerals on the moon, and also prepare a 3-diemensional map of the entire lunar surface. The mission will also give clues on the early origin of the moon.
Mr. Prasad said, “We will be able to confirm whether there is water on the surface of the moon near the Poles with the help of the Chandrayaan mission.” Water on the moon was first identified by a NASA mission called Clementine. Based on that, NASA concluded that there could be a possibility of water in the moon’s South Pole, he added.

Moon Impact Probe S. Satish, Director, Publications and Public Relations, ISRO, said an important Indian payload on the Chandrayaan-1 was the Moon Impact Probe (MIP). When the spacecraft reached the lunar orbit at an altitude of 100 km, the MIP would eject from Chandrayaan. As the MIP sped towards the moon’s surface, its video-camera would take pictures of the lunar surface.

Its altimeter would measure the instantaneous altitude from the moon. A third instrument, a mass spectrometer, would sniff the tenuous atmosphere above the moon. V. Seshagiri Rao, Deputy Director, Range Operations, Sriharikota, said each payload on the Chandrayaan, was subjected to different tests at Sriharikota.
 
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tblaxland

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All set: The fully assembled PSLV-C11, which will launch Chandrayaan-1 on October 22, stands encased in the Vehicle Assembly Building of the second launch pad at Sriharikota on Saturday.
I think there is a mix up with the caption here. Either someone has made off with the PSLV or that is not the Vehicle Assembly Building! Thanks to Google, I think this is the VAB:
nat2.jpg
 

BrianJ

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Good luck ISRO and Chandrayaan team! Look's like they'll beat LCROSS to it (by way of slamming things into the Moon to look for water ice). Although, from what I've read, there are doubts about the likelihood of finding anything at the South Pole - Lcross has been retargeted to the North Pole. I guess ISRO may do the same for the Chandrayaan MIP?

Any chance of anyone making Chandrayaan for Orbiter in the next 5 days? :lol: Just a thought....

regards,
Brian
 

Notebook

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Will there be any webcasts of the launch?

N.
 

DaveS

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NASA TV broadcastig this launch.
 

thomasantony

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Thats cool!! T- 9 minutes


-----Posted Added-----


Liftoff will be at 06:21:10 hrs.


-----Posted Added-----


T-6 minutes


-----Posted Added-----


T-4 minutes


-----Posted Added-----


T - 1 minute


-----Posted Added-----


Liftoff!!


-----Posted Added-----


T+1 minute. 15km downrange


-----Posted Added-----


Strap-on sep.


-----Posted Added-----


T+3minutes. All systems nominal.


-----Posted Added-----


Heat shield sep and Third stage ignition


-----Posted Added-----


T+400s. Velocity 7.3 km/s


-----Posted Added-----


Third stage sep. 4th stage ignition


-----Posted Added-----


Velocity-8.4 Km/s and still going


-----Posted Added-----


T+1052.4s . PS4 cutoff. Velocity - 9.24 Km/s


-----Posted Added-----


Chandrayaan-1 in Earth Orbit!
 

tblaxland

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Congratulations!

Do you have any data on when apogee raise/TLI manoeuvres are expected?
 

tblaxland

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Thanks N. That page contained a little more info on the trajectory:
chandrayaan-1_mission_phase_H.jpg
 

thomasantony

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Hey,
The first orbit-raising burn is complete. now the orbit is 305km x 37900km.

http://isro.org/pressrelease/Oct23_2008.htm

The first orbit-raising manoeuvre of Chandrayaan-1 spacecraft was performed at 09:00 hrs Indian Standard Time (IST) this morning (October 23, 2008) when the spacecraft’s 440 Newton Liquid Engine was fired for about 18 minutes by commanding the spacecraft from Spacecraft Control Centre (SCC) at ISRO Telemetry, Tracking and Command Network (ISTRAC) at Peenya, Bangalore. With this engine firing, Chandrayaan-1’s apogee has been raised to 37,900 km, while its perigee has been raised a little, to 305 km. In this orbit, Chandrayaan-1 spacecraft takes about 11 hours to go round the Earth once.

Chandrayaan-1, India’s first spacecraft to Moon, was successfully launched by PSLV-C11 yesterday (October 22, 2008) from Satish Dhawan Space Centre SHAR, Sriharikota. The launch vehicle placed Chandrayaan-1 in an elliptical orbit with a perigee (closest point to the earth) of 255 km and apogee (farthest point to earth) of 22,860 km. In this initial orbit, Chandrayaan-1 orbited the Earth once in about six and a half hours. Following its successful launch, the SCC acquired the first signals and conducted preliminary operations on Chandrayaan-1. The Deep Space Network (DSN) at Bylalu tracked the spacecraft in this orbit and received signals in S and X band and has sent commands to the spacecraft.

All systems onboard the spacecraft are functioning normally. Further orbit raising maneuvers are planned in the coming few days.
~
thomas
 

thomasantony

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Chandrayaan's orbit raised further

Chandrayaan's orbit was further raised today morning. Now its in a 336km by 74715 km Orbit.

The second orbit-raising manoeuvre of Chandrayaan-1 spacecraft was carried out at 05:48 hrs IST this morning (October 25, 2008) when the spacecraft’s 440 Newton Liquid Engine was fired for about 16 minutes by commanding the spacecraft from Spacecraft Control Centre (SCC) at ISRO Telemetry, Tracking and Command Network (ISTRAC) at Peenya, Bangalore. With this engine firing, Chandrayaan-1’s apogee has been further raised to 74,715 km, while its perigee has been raised to 336 km. In this orbit, Chandrayaan-1 spacecraft takes about twenty-five and a half hours to go round the Earth once. This is the first time an Indian spacecraft has gone beyond the 36,000 km high geostationary orbit and reached an altitude more than twice that height.

It may be recalled that Chandrayaan-1, India’s first spacecraft to Moon, was successfully launched by PSLV-C11 on October 22, 2008 from Satish Dhawan Space Centre SHAR, Sriharikota. The launch vehicle placed Chandrayaan-1 in an elliptical orbit with a perigee (closest point to earth) of 255 km and apogee (farthest point to earth) of 22,860 km. The first orbit-raising manoeuvre was performed on October 23, 2008 by firing the spacecraft’s liquid engine for 18 minutes resulting in the increase of the spacecraft orbit’s apogee to 37,900 km and the perigee to 305 km. The Indian Deep Space Network (IDSN) at Bylalu is tracking the spacecraft in the present orbit, receiving signals in S and X bands and is sending commands to the spacecraft.

All systems onboard the spacecraft are functioning normally. Further orbit raising maneuvers to take Chandrayaan-1 to still higher orbits are planned in the next few days.
orbitrize2.jpg

http://isro.org/pressrelease/Oct25_2008a.htm

~
Thomas
 

Notebook

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Good for Chandrayaan-1; hoping every event goes well.

Edit: Had a look at the Chandrayaan websit, and they have this image:-

http://www.isro.org/chandrayaan/htmls/mission_sequence.htm

I assume the Lunar burns are just schematics, they wouldn't be out of the plane of the Earth burns would they?

N.
 
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thomasantony

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Well,
Its supposed to go into a Polar Lunar Orbit. So they will probably do some plane-change burn sometime after TLI so that their LOI burn places them in a polar orbit. The plane change should be low delta-v if done far enough away from both Earth and moon.

Here is the schematic anyway:
mission1.jpg

~
Thomas
 
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